An agent that has an affinity for serotonin receptors and is able to mimic the effects of serotonin by stimulating the physiologic activity at the cell receptors. Serotonin agonists are used as antidepressants, anxiolytics, and in the treatment of migraine disorders.

A xenobiotic (Greek, xenos "foreign"; bios "life") is a compound that is foreign to a living organism. Principal xenobiotics include: drugs, carcinogens and various compounds that have been introduced into the environment by artificial means.

An agent that has an affinity for serotonin receptors and is able to mimic the effects of serotonin by stimulating the physiologic activity at the cell receptors. Serotonin agonists are used as antidepressants, anxiolytics, and in the treatment of migraine disorders.